hydro grouting sponge, Extremely absorbent. Excellent for grout cleaning hydro grouting sponge, Round polishing finished2.Extremely absorbent.Excellent for grouting,3.Made of plastic, Big-porous.4.Size: 165x110x50, 180x130x50mm, all sizes are available.5.Epoxy sponge & Viscose sponges are available as well. Grout sponge, tile sponge, clean sponge